Heavily armed police were on the scene of a barricade situation near CIA headquarters Wednesday morning, according to the Fairfax County Police Department and images circulating on social media.

The department posted that its Special Operations Division, which includes the county’s SWAT team, was at the scene in McLean, Virginia. Authorities have shut down Dolley Madison Boulevard in both directions between Georgetown Pike and Savile Lane, police said.

It was not immediately clear what sparked the incident.

Ellen Nakashima contributed to this report.

This is a developing story and will be updated.